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関連する概念動画

Aldol Condensation vs Claisen Condensation01:33

Aldol Condensation vs Claisen Condensation

7.8K
Aldol condensation is an acid or base-catalyzed condensation between aldehydes or ketones to give an α,ꞵ-unsaturated carbonyl compound. A base-promoted condensation between ester molecules to produce a ꞵ-ketoester is known as the Claisen condensation. In the presence of a base, both reactions involve deprotonation of the acidic α hydrogen to produce the corresponding enolates. The nucleophilic enolates attack their respective nonenolized carbonyl compound forming a tetrahedral...
7.8K
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

20.7K
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
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Aldol Condensation with β-Diesters: Knoevenagel Condensation01:27

Aldol Condensation with β-Diesters: Knoevenagel Condensation

3.7K
The Knoevenagel condensation is an aldol-type reaction involving the condensation of aldehydes or ketones with active methylene compounds such as β-diesters to produce substituted olefins.
3.7K
Accelerators01:17

Accelerators

278
Accelerators in concrete serve as admixtures to speed up the hardening process, enabling the concrete to achieve early strength faster. Although accelerators do not necessarily impact the time it takes concrete to set, they reduce this time in practice. A common accelerator is calcium chloride, which is particularly useful for hastening early strength development in cold weather or for rapid repair jobs that require quick heat generation after mixing.
The effectiveness of calcium chloride can...
278
Accelerating Fluids01:17

Accelerating Fluids

2.3K
When a fluid is in constant acceleration, the pressure and buoyant force equations are modified. Suppose a beaker is placed in an elevator accelerating upward with a constant acceleration, a. In the beaker, assume there is a thin cylinder of height h with an infinitesimal cross-sectional area, ΔS.
The motion of the liquid within this infinitesimal cylinder is considered to obtain the pressure difference. Three vertical forces act on this liquid:
2.3K
Instantaneous Acceleration01:16

Instantaneous Acceleration

22.8K
Acceleration is in the direction of the change in velocity, but it is not always in the direction of motion. When an object slows down, its acceleration is opposite to the direction of its motion. Although commonly referred to as deceleration, this causes confusion in our analysis as deceleration is not a vector, and does not point to a specific direction with respect to a coordinate system. Therefore, the term deceleration is not used. For example, when a subway train slows down, it...
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The Assembly and Application of 'Shear Rings': A Novel Endothelial Model for Orbital, Unidirectional and Periodic Fluid Flow and Shear Stress
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加速器のリングに含まれる高音速ボース・アインシュタイン濃縮物

Saurabh Pandey1,2, Hector Mas1,3, Giannis Drougakis1,2

  • 1Institute of Electronic Structure and Laser, Foundation for Research and Technology - Hellas, Heraklion, Greece.

Nature
|June 7, 2019
PubMed
まとめ
この要約は機械生成です。

研究者はボース・アインシュタイン凝縮物 (BEC) の制御可能な物質波ガイドを作成し,重力マッピングや慣性ナビゲーションなどのアプリケーションのためのコンパクトで敏感な原子干渉計を可能にしました.

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The Assembly and Application of 'Shear Rings': A Novel Endothelial Model for Orbital, Unidirectional and Periodic Fluid Flow and Shear Stress
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科学分野:

  • 原子,分子,光学物理学
  • 量子制御
  • 凝縮物質物理学

背景:

  • 高精度な測定はしばしば原子雲による物質波干渉測定に依存する.
  • 現在の方法は大きな装置や 微重力環境で 長い尋問時間を要します
  • 重力の効果を無効にすると 感度が向上する コンパクトな装置が生まれます

研究 の 目的:

  • ボーゼ-アインシュタイン凝縮物 (BEC) をマクロ距離に輸送するための制御可能な物質波ガイドを実証する.
  • 尋問時間を延長することで,繊細な測定のためのコンパクトなデバイスを可能にします.
  • 超冷たい原子を使って 新しい量子現象と応用を探求する

主な方法:

  • 中性原子加速器リングを使用してボース-アインシュタイン凝縮物 (BEC) を輸送する.
  • 超音速 (音速の16倍) を達成する.
  • 15cmの磁気波の誘導体を利用し,コヒーレンスを維持する.

主要な成果:

  • 滑らかで制御可能な物質波導体
  • 輸送中にBECの内部一貫性を維持する.
  • 高角運動量 (>40,000ħ/原子) と超音速を達成した.
  • ピコケルビン精度で制御する

結論:

  • コヘレントな物質-波ガイドは,コンパクトなデバイスで延長された相互作用時間を可能にします.
  • 超冷たい原子における超流動性,トンネリング,および輸送体制の研究を容易にする.
  • 慣性ナビゲーションと重力マッピングのためのポータブル誘導原子インターフェロメーターの道を開く.